Wide-range Speed Control for Diaphragm Metering Pumps: LEWA ecodos collection with new motor

In many functions, metering components within the pharmaceutical or meals industry for instance, pumps are required that not only can be precisely controlled by method of move fee and dosing time, but also convey the elements particularly gently. To enable the proven pump units of the ecodos sequence from LEWA GmbH to fulfill this demanding process with even more flexibility and vitality efficiency sooner or later, the manufacturer is expanding the portfolio to include a new form of wide-range pace control. Alongside asynchronous motors and servomotors, permanent magnet synchronous motors, or PMSMs for brief, are also used now. They are characterized by excessive energy efficiency and a management vary greater than 1:200. This significantly expands the range of applications. With เกรดวัดแรงดัน , it is no longer needed to use several pumps for various flow rates or oversize asynchronous motors for low speeds. Since PMSMs can be designed and not using a fan, they remain compact and straightforward to wash. The latter characteristic predestines them for hygienic functions. High effectivity ranking over the entire management range in accordance with energy effectivity class IE5+ also reduces vitality costs, thus guaranteeing a decrease whole cost of possession (TCO).
The diaphragm metering pumps within the LEWA ecodos sequence are notably properly suited to functions within the food or pharmaceutical industries. All supplies in touch with the fluids used within the pump models meet the FDA and USP Class VI requirements, and the EU directives for the meals business. In the hygienic model, for example, the pump head is manufactured from PP or electropolished chrome steel with a surface roughness < 0.5 µm. This facilitates cleaning of the surfaces in touch with the product.
The motor applied sciences used so far have had to make sacrifices: “For basic asynchronous motors whose rotor is a squirrel-cage rotor, the control vary stays limited to 1:10 (1:50 is feasible in particular person cases). With encoder feedback, important expansion is feasible,” mentioned Maurice Wirkner, an application manager at LEWA. “In addition, the drive is comparatively inefficient exterior the rated velocity range – particularly at low speeds. This requires the drive to be outsized, which will increase working prices.” Servomotors are optimized for extremely dynamic requirements and also cover the whole management range (1-210 pump strokes), nevertheless, they are dearer to purchase and as nicely as, require a servo inverter for management.
Wide-range pace control with permanent magnet synchronous motor extends the range of purposes
LEWA has now expanded its own portfolio with a drive expertise that does not have these weaknesses. “Unlike the asynchronous motor, the rotor of this drive consists of permanent magnets and rotates synchronously, i.e. without load-dependent slip,” Wirkner defined. “Among different things, it options an extreme management range, which often makes the use of multiple pumps for various circulate rates pointless.” Particularly within the case of a quantity of pumps, an extra guide stroke adjustment or electric stroke adjustment could be allotted with and the required move fee could be realized by speed control solely. The PMSM also has a continuing torque. The full torque could be utilized from engine speed 0 rpm (standstill) as a lot as the rated velocity of the motor. This ensures significantly clean and mild system start-up, since every process may be began with a pump capability of 1 % as an alternative of the identical old 10 %.
It also contains a high short-term overload capability, which permits a drive design with out oversizing for the starting torque. As a outcome, smaller, more cost-efficient sizes may be realized than with traditional drives. “Like the asynchronous motor, the PMSM can be controlled through a regular frequency converter, so users can depend on common components,” Wirkner explained. “With the servomotor on the contrary, it would be necessary to buy expensive servo controllers.” The compact drive may be simply cleaned because of its fanless design and presents high IP protection. If required an additional conversion course of – called nsd tupH – may be applied to the aluminum physique for FDA requirements. This makes the surface extraordinarily resistant and even easier to clean – best for applications with stringent hygienic necessities, corresponding to aroma metering within the food trade or additive dosing within the pharmaceutical business.
IE5+ PMSM allows value reduction and decentralized options
The sole limitation of the presently used PMSM is that it is only obtainable for secure areas. “Thanks to wide-range velocity control with IE5+ PMSM, we are able to meet the rising buyer demands for a wider adjustment range and decrease power consumption, in addition to general costs,” mentioned Wirkner to sum up the state of affairs. “The subject of energy efficiency in particular is changing into increasingly important for our customers. A decentralized solution by which the frequency converter is put in instantly on the PMSM, can now be applied with Getriebebau NORD GmbH & Co. KG, LEWA’s motor companion for PMSM, too.”
LEWA GmbH was based in 1952 by Herbert Ott and Rudolf Schestag as a family enterprise and is at present the world’s leading manufacturer of metering pumps and process diaphragm pumps in addition to complete metering packages for course of engineering. Headquartered in Leonberg, the company developed into an international group in just a few a long time. Since 2022, the company has been a half of the Atlas Copco Group, a globally leading Swedish manufacturer of compressors, vacuum solutions, mills, pumps, power tools and assembly methods. Together with the model new proprietor, LEWA will further expand the commercial pumps business. As a analysis and manufacturing firm, LEWA develops technologies and offers options for the huge array of applications among its customers. Its merchandise are used mainly within the chemical business, the cosmetics industry, prescription drugs and biotechnology, food and beverage trade and power utilities in addition to in the production of plastics, detergents and cleaners. Additional utility areas embody refineries and petrochemicals, the oil and gasoline business, and fuel odorization. LEWA presently employs round 1,200 individuals and owns 14 subsidiaries all over the world alongside having eighty representatives and gross sales places of work in additional than eighty nations.
Image materials:
Image ID: LEWA ecodos LED3 WBR.jpg
Caption: LEWA ecodos LED3 with PMSM
Source: LEWA GmbH
Image ID: ecodos_NORD-IE5plus_opt.jpg
Caption: The PMSMs newly added to the portfolio feature a control vary of 1:200, enabling a wider vary of applications to be lined by the same drive or pump.
Source: LEWA GmbH
Image ID: Baby meals.jpg
Caption: The PMSM also has a relentless torque, i.e. all the torque could be referred to as up at pace zero rpm. This ensures particularly clean and mild system start-up, since each course of can be began with a conveyance fee of 1 % instead of the standard 10 p.c. (Example: Metering omega three fatty acids in the manufacturing of child food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In distinction to the ASMs proven, the constant torque of the PMSM permits steady operation at low speeds. Oversizing for the required pump starting torque has turn out to be unnecessary because of the high overload capability of the PMSM.
Source: LEWA GmbH
Image ID: Baugrößen_530PWebJPG.jpg
Caption: Like the asynchronous motor, the PMSM can be controlled through a standard frequency converter (NORD, Danfoss, etc.) with particular parameterization, so that users can rely on common elements.
Source: Getriebebau NORD GmbH & Co. KG
Image ID: NORDAC ON Wandmontage BG2_806x502Web.jpg / Nordac ON+ with frequency converter on an IE5 PMSM.jpg
Caption: Decentralized solutions by which the frequency converter is put in directly on the PMSM are also already possible with the PMSMs selected by LEWA.
Source: Getriebebau NORD GmbH & Co. KG
Image ID: Functional testing.jpg
Caption: As early as 2020, LEWA carried out preliminary practical testing with the NORD PMSM prototype and an ecodos pump on the pump test bench. In the lower pace range above all, the PMSM efficiently demonstrated the benefits of constant torque: the ecodos test pump could be pushed in a variety of 1:480 as much as 5 bar.
Source: LEWA GmbH
More info for readers/viewers/interested events:
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Phone: +49 7152 14-0, Fax: +49 7152 14-1303
Email: lewa@lewa.de
Internet: www.lewa.de
More data for members of the press
ABOPR Pressedienst B.V.
Stefan-George-Ring 19, 81929 Munich, Germany
Phone: +49 89 500315-20, Fax: +49 89 500315-15
Email: info@abopr.de
Internet: www.abopr.de

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